Fire-box.



S. W. SIMONDS.

FIRE Box. APPLICATlON [ILED OCT- 2|, |915- Patentedl. Feb

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SAMUEL W. SIMONDS, OF BOSTON, MASSACHUSETTS.

FIRE-BOX.

To all whom'z't may concern.'

Be it known that I, SAMUEL WV. SIMoNDs, a citizen ofthe United States, .and resident of Boston, in the county of Suffolk and State of'litassachusetts, have invented certain new and `useful Improvements in Fire- Boxes, of which the following is a specification.

This invention relates to a locomotive fire box provided internally with two re brick arches located above the fuel space and maintained in a heated condition by the lire, to heat and cause a relatively complete consumption of the evolved products of combustion on their way to the boiler tubes, the arches being arranged as shown by the Fulton Patent 711,044, the two arches described by said patent being a rear arch attached to the rear wall of the fire box above the fire door opening, and a front arch separated from the rea-r arch by a throat through Which the products of combustion pass on their way to the boiler tubes.

It is desirable, as disclosedby the said Fulton patent, first to supply air to the.

products of 'combustion in such manner and to such extent that these products cannot escape before being mingled with suiicient oxygen to effect perfect combustion, and secondly to heat the supplied air as highly as practicable.

In the structure shown by the Fulton patent the air is supplied by and heated in tubes passing through the rear wall of the fire box vabove the re door opening7 said tubes being independent of the fire door and extending through or above the rear arch. Much of the space on the fire box wall above the door opening is necessarily occupied-by other adjuncts, so that the space available for said tubes is so limited that it is not practicable to admit suflicient vair in this way. A v Y My invention has for its object to enable an additional quantity of air to be supplied through the fire door, the air thus admitted being 'deflected to and heated inthe lower portion of the fire box, so that there willbe no impingement of relatively cool air, ad-

mitted through the door, against the hea-ted arches, and therefore no cracking or crumbling of the lire brick due to unequal temperatures.

To this end the invention consists in the improvements which I will describe and claim.

" Specification of Letters Patent.

now proceed to Patented Feb. C5, 191'?.

Application filed Gctober 21, 1915. Serial No. 57,160.

0f the accompanying drawings forming a part of this specification:

Figure 1 represents an elevation of the exterior of the rear Wall of a ire box embodying my invention; 4

Fig. 2 represents a section on line 2-2 0f Fig. 1;

Fig. 2a represents an enlargement of a portion of Fig. 2;

Fig. 3 represents a. view similar to Fig. l, the screen hereinafter referred to being omitted;

Fig. 4: represents a section on line i of Fig. 3;

Fig. 5 represents an elevation of a. portion of the inner side of the rear wall .and an elevation of the inner vside of the fire door;

Fig. 6 represents an enlargement of a portion of Fig. 1, the fire door being open and shown in section;

Fig. 7 represents an edge view of the door frame and door, and a portion of one sideof the fire box;

Fig. 8 represents a perspective view of the screen;

Fig. 9 represents a perspective view of the deiector;

Fig. `10`represents a perspective view of the door without the screen and defiector.

The same reference characters indicate the same or similar parts in all the views.

In the drawings, 12 represents a locomotive fire box, the rear wall of which has the usual'fire door opening 13.

14 and 15 represent fire brick arches within the re box. These arches may be supported and arranged as shown by the Fulton patent above mentioned, and separated by a throat 16, the rear arch l-L being attached to the rear wall of the fire box immediately above the door opening 13, and the front arch being attached to the front wall of the fire box.

Air is admitted to the fire box above the door opening by air heater tubes 10, arranged as shown by the Fulton patent, said tubes being shown only by Figs. 1 and 2.

17 represents a door formed to close the opening 13 and, in this embodiment of the invention, mounted to swing horizontally on vertical hinges the members 18 of which are attached to the door. The door is apertured to permit air to pass through it into the re box, four apertures 19 being preferably provided.

20 represents a plate constituting a delector adapted to cause the entering air to pass downwardly, as indicated by the arrows (Fig. 2), toward the grate, the approximate level of which is indicated by the dotted line 21.

The upper portion of the deiiector is preferably connected by a horizontal hinge with the upper portion of the door, the hinge as here shown including members 22 projecting inwardly from the inner side of the door, and a complemental member 22a projecting upwardly from the upper edge of the deflector. The object of this hinge connection is to enable the deflector to be automatically projected inwardly from the door, as shown by Figs. 2 and 4, when the door is closed, so that air is permitted to passfreely between the door and the deflector, and to automatically assume a position in close proximity to the door, as shown by Fig. 6, when the door is opened, the deiiector being therefore stored in a non-obstructing position.

The fire box has a suitable abutment, which may be a fixed ear or shoulder 24 preferably attached to the upper portion of the door frame and projecting into the door opening.

VThe deflector is provided with a member coperating with said abutment, said member as here shown being an ear 25 projecting upwardly from the upper edge of the detlector. The relative arrangement of the defiector, its ear 25 and the fixed shoulder 24 is such that when the door is closed the ear 25 abuts against the shoulder 24 and is displaced from its normal position to swing the deflector into the fire box. When the ear 25 is separated from the shoulder 24 by the opening of the door, the deiector swings downwardly by its own weight against or into close proximity to the door.

The ear may be provided with an adjustable bearing screw 25a (Fig. 2a), which may coperate with the abutment 24 in varying the projection of the lower edge of the deiiector from the door.

It will now be seen that the door is adapted to admit air to the fire box, in addition to that supplied by the heater tubes, and that the air entering through the door is deflected downwardly so that it cannot impinge in a relatively cold condition against the arches 14 and 15. Cracking or crumbling of the heated fire brick, such as would be likely to be caused by the impingement ofV relatively cold air thereon, is thus avoided, the entering air being heated below the heated iire brick before impinging thereon. The two instrumentalities for admitting air respectively at the throat and below the throat insure a sufcient supply of heated air to cause perfect combustion.

It is obvious that the same result would be secured if the deflector were rigidly se* cured to the door in the position shown by Figs. 2 and 4, so that my invention is not necessarily limited to the hinge Vconnection of the deflector to the door. VSaid hinge connection is very desirable however for the reasons above set forth. Y

To prevent direct light and heat rays from passing outwardly and upwardly through the door into the cab, when the door is closed, I provide a hood or screen 27, which is attached to the outer side of the door and is open at its lower end to permit air to pass upwardly through it, theV screen being closed above its lower end and constituting a barrier between the apertures 19 in the door and the working space in the cab.Y

rIhe air-passage through thescreen should be accurately proportioned to the capacity of the door apertures 19, and screens of different sizes may be provided to be usedk interchangeably.

Having described my invention, I claim:

A fire box having a rear wall containing a fire door opening, a rear arch above said opening, a front arch extending from the front wall of the fire box toward the rear arch and separated from the latter by an intermediate throat through which the products of combustion pass from the fire box to the boiler tubes, air heater tubes extending through the rear wallY for supplying heated air to the said throat, and additional means for supplying heated air below said throat, said means including an apertured fire door associated with said opening', and a def flector on said door arranged to direct the air entering through the door downwardly into the fire box and cause it to be Vheated before impinging on the arch portions forming the sides of said throat.

In testimony whereof I have aiiixedmy signature.

SAMUEL W. SIMONDS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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